path: root/include/linux/cgroup.h
diff options
authorMichael S. Tsirkin <mst@redhat.com>2010-09-09 16:37:37 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-09-09 18:57:23 -0700
commit31583bb0cf6cc40f2a468a4d2f3b9cbefd24f891 (patch)
tree1c9ff4ff83ef80fe0b9b5d6fa7ec9af1ebbc2209 /include/linux/cgroup.h
parentproc: export uncached bit properly in /proc/kpageflags (diff)
cgroups: fix API thinko
Add cgroup_attach_task_all() The existing cgroup_attach_task_current_cg() API is called by a thread to attach another thread to all of its cgroups; this is unsuitable for cases where a privileged task wants to attach itself to the cgroups of a less privileged one, since the call must be made from the context of the target task. This patch adds a more generic cgroup_attach_task_all() API that allows both the source task and to-be-moved task to be specified. cgroup_attach_task_current_cg() becomes a specialization of the more generic new function. [menage@google.com: rewrote changelog] [akpm@linux-foundation.org: address reviewer comments] Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Tested-by: Alex Williamson <alex.williamson@redhat.com> Acked-by: Paul Menage <menage@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Ben Blum <bblum@google.com> Cc: Sridhar Samudrala <sri@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
1 files changed, 11 insertions, 1 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index ed3e92e41c6e..0c991023ee47 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -578,7 +578,12 @@ struct task_struct *cgroup_iter_next(struct cgroup *cgrp,
void cgroup_iter_end(struct cgroup *cgrp, struct cgroup_iter *it);
int cgroup_scan_tasks(struct cgroup_scanner *scan);
int cgroup_attach_task(struct cgroup *, struct task_struct *);
-int cgroup_attach_task_current_cg(struct task_struct *);
+int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
+static inline int cgroup_attach_task_current_cg(struct task_struct *tsk)
+ return cgroup_attach_task_all(current, tsk);
* CSS ID is ID for cgroup_subsys_state structs under subsys. This only works
@@ -636,6 +641,11 @@ static inline int cgroupstats_build(struct cgroupstats *stats,
/* No cgroups - nothing to do */
+static inline int cgroup_attach_task_all(struct task_struct *from,
+ struct task_struct *t)
+ return 0;
static inline int cgroup_attach_task_current_cg(struct task_struct *t)
return 0;